test_pref_interval.js

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/**

 * What this is aimed to test:

 * Expiration relies on an interval, that is user-preffable setting

 * "places.history.expiration.interval_seconds".

 * On pref change it will stop current interval timer and fire a new one,

 * that will obey the new value.

 * If the pref is set to a number <= 0 we will use the default value.

*/

// Default timer value for expiration in seconds.  Must have same value as

// PREF_INTERVAL_SECONDS_NOTSET in nsPlacesExpiration.

const DEFAULT_TIMER_DELAY_SECONDS = 3 * 60;

// Sync this with the const value in the component.

const EXPIRE_AGGRESSIVITY_MULTIPLIER = 3;

var tests = [

    desc: "Set interval to 1s.",

    interval: 1,

    expectedTimerDelay: 1 * EXPIRE_AGGRESSIVITY_MULTIPLIER,

},

    desc: "Set interval to a negative value.",

    interval: -1,

    expectedTimerDelay:

      DEFAULT_TIMER_DELAY_SECONDS * EXPIRE_AGGRESSIVITY_MULTIPLIER,

},

    desc: "Set interval to 0.",

    interval: 0,

    expectedTimerDelay:

      DEFAULT_TIMER_DELAY_SECONDS * EXPIRE_AGGRESSIVITY_MULTIPLIER,

},

    desc: "Set interval to a large value.",

    interval: 100,

    expectedTimerDelay: 100 * EXPIRE_AGGRESSIVITY_MULTIPLIER,

},

];

add_task(async function test() {

  // The pref should not exist by default.

  Assert.throws(() => getInterval(), /NS_ERROR_UNEXPECTED/);

  // Force the component, so it will start observing preferences.

  force_expiration_start();

  for (let currentTest of tests) {

    currentTest = tests.shift();

    print(currentTest.desc);

    let promise = promiseTopicObserved("test-interval-changed");

    setInterval(currentTest.interval);

    let [, data] = await promise;

    Assert.equal(data, currentTest.expectedTimerDelay);

  clearInterval();

});